题目内容
(2004?北塘区)
| 32×40+450÷18 |
|
(6-1.3×4)÷0.1 | ||||||||||||||||
| 13.7×1.4-3.7×1.4 | (
|
|
分析:(1)先算乘除,再算加法;
(2)运用加法交换律与结合律简算;
(3)先算括号内的乘法,再算括号内的减法,最后算括号外的除法;
(4)运用乘法分配律简算;
(5)先算括号内的乘法,再算括号内的加法,最后算括号外的除法;
(6)先算小括号内的,再算中括号内的,最后算括号外的减法.
(2)运用加法交换律与结合律简算;
(3)先算括号内的乘法,再算括号内的减法,最后算括号外的除法;
(4)运用乘法分配律简算;
(5)先算括号内的乘法,再算括号内的加法,最后算括号外的除法;
(6)先算小括号内的,再算中括号内的,最后算括号外的减法.
解答:解:(1)32×40+450÷18,
=1280+25,
=1305;
(2)
+
+
+
,
=(
+
)+(
+
),
=1+1,
=2;
(3)(6-1.3×4)÷0.1,
=(6-5.2)÷0.1,
=0.8÷0.1,
=8;
(4)13.7×1.4-3.7×1.4,
=(13.7-3.7)×1.4,
=10×1.4,
=14;
(5)(
+
×
)÷
,
=(
+
)×
,
=
×
,
=
;
(6)
-[(
+
)÷
],
=
-
÷
,
=
-
×
,
=
-
,
=
.
=1280+25,
=1305;
(2)
| 3 |
| 11 |
| 3 |
| 5 |
| 8 |
| 11 |
| 2 |
| 5 |
=(
| 3 |
| 11 |
| 8 |
| 11 |
| 2 |
| 5 |
| 3 |
| 5 |
=1+1,
=2;
(3)(6-1.3×4)÷0.1,
=(6-5.2)÷0.1,
=0.8÷0.1,
=8;
(4)13.7×1.4-3.7×1.4,
=(13.7-3.7)×1.4,
=10×1.4,
=14;
(5)(
| 2 |
| 3 |
| 6 |
| 7 |
| 7 |
| 24 |
| 11 |
| 32 |
=(
| 2 |
| 3 |
| 1 |
| 4 |
| 32 |
| 11 |
=
| 11 |
| 12 |
| 32 |
| 11 |
=
| 8 |
| 3 |
(6)
| 5 |
| 6 |
| 1 |
| 5 |
| 1 |
| 3 |
| 8 |
| 9 |
=
| 5 |
| 6 |
| 8 |
| 15 |
| 8 |
| 9 |
=
| 5 |
| 6 |
| 8 |
| 15 |
| 9 |
| 8 |
=
| 5 |
| 6 |
| 3 |
| 5 |
=
| 7 |
| 30 |
点评:此题考查了四则混合运算,注意运算顺序和运算法则,灵活运用所学的运算定律简便计算.
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